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<div class="chapter">
<div class="titlepage"><div><div><h2 class="title">
<a name="xmlsec-notes-init-shutdown"></a>Initialization and shutdown.</h2></div></div></div>
<p>XML Security Library initialization/shutdown 
	process includes initialization and shutdown of the
	dependent libraries:
	</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>libxml library;</p></li>
<li class="listitem"><p>libxslt library;</p></li>
<li class="listitem"><p>crypto library (OpenSSL, GnuTLS, GCrypt, NSS, ...);</p></li>
<li class="listitem"><p>xmlsec library 
		(<a class="link" href="xmlsec-xmlsec.html#xmlSecInit" title="xmlSecInit ()">xmlSecInit</a> 
		and <a class="link" href="xmlsec-xmlsec.html#xmlSecShutdown" title="xmlSecShutdown ()">xmlSecShutdown</a> 
		functions);
	    </p></li>
<li class="listitem"><p>xmlsec-crypto library
		(<a class="link" href="xmlsec-dl.html#xmlSecCryptoDLLoadLibrary" title="xmlSecCryptoDLLoadLibrary ()">xmlSecCryptoDLLoadLibrary</a> 
		to load xmlsec-crypto library dynamicaly if needed, 
		<a class="link" href="xmlsec-app.html#xmlSecCryptoInit" title="xmlSecCryptoInit ()">xmlSecCryptoInit</a> 
		and <a class="link" href="xmlsec-app.html#xmlSecCryptoShutdown" title="xmlSecCryptoShutdown ()">xmlSecCryptoShutdown</a> 
		functions);
	    </p></li>
</ul></div>
<p>
	xmlsec-crypto library also provides a convinient functions 
	<font>xmlSecAppCryptoInit</font> 
	and <font>xmlSecAppCryptoShutdown</font> 
	to initialize the crypto library itself but application can do it 
	by itself.
	</p>
<p>
	     </p>
<div class="example">
<a name="id-1.2.5.3.1"></a><p class="title"><b>Example 8. Initializing application.</b></p>
<div class="example-contents"><pre class="programlisting">
    /* Init libxml and libxslt libraries */
    xmlInitParser();
    LIBXML_TEST_VERSION
    xmlLoadExtDtdDefaultValue = XML_DETECT_IDS | XML_COMPLETE_ATTRS;
    xmlSubstituteEntitiesDefault(1);
#ifndef XMLSEC_NO_XSLT
    xmlIndentTreeOutput = 1; 
#endif /* XMLSEC_NO_XSLT */
        	
    /* Init xmlsec library */
    if(xmlSecInit() &lt; 0) {
	fprintf(stderr, "Error: xmlsec initialization failed.\n");
	return(-1);
    }

    /* Check loaded library version */
    if(xmlSecCheckVersion() != 1) {
	fprintf(stderr, "Error: loaded xmlsec library version is not compatible.\n");
	return(-1);
    }    

    /* Load default crypto engine if we are supporting dynamic
     * loading for xmlsec-crypto libraries. Use the crypto library
     * name ("openssl", "nss", etc.) to load corresponding 
     * xmlsec-crypto library.
     */
#ifdef XMLSEC_CRYPTO_DYNAMIC_LOADING
    if(xmlSecCryptoDLLoadLibrary(NULL) &lt; 0) {
	fprintf(stderr, "Error: unable to load default xmlsec-crypto library. Make sure\n"
			"that you have it installed and check shared libraries path\n"
			"(LD_LIBRARY_PATH) envornment variable.\n");
	return(-1);	
    }
#endif /* XMLSEC_CRYPTO_DYNAMIC_LOADING */

    /* Init crypto library */
    if(xmlSecCryptoAppInit(NULL) &lt; 0) {
	fprintf(stderr, "Error: crypto initialization failed.\n");
	return(-1);
    }

    /* Init xmlsec-crypto library */
    if(xmlSecCryptoInit() &lt; 0) {
	fprintf(stderr, "Error: xmlsec-crypto initialization failed.\n");
	return(-1);
    }
		</pre></div>
</div>
<p><br class="example-break">
	</p>
<p>
	     </p>
<div class="example">
<a name="id-1.2.5.4.1"></a><p class="title"><b>Example 9. Shutting down application.</b></p>
<div class="example-contents"><pre class="programlisting">
    /* Shutdown xmlsec-crypto library */
    xmlSecCryptoShutdown();
    
    /* Shutdown crypto library */
    xmlSecCryptoAppShutdown();
    
    /* Shutdown xmlsec library */
    xmlSecShutdown();

    /* Shutdown libxslt/libxml */
#ifndef XMLSEC_NO_XSLT
    xsltCleanupGlobals();            
#endif /* XMLSEC_NO_XSLT */
    xmlCleanupParser();		
		</pre></div>
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